Why ASML Holdings Fell in October

ASML fell 11.5% in October even as the company posted Q3 revenue growth of 55.2% and lifted its 2028 capacity expansion plans. The selloff had little to do with the company's own numbers.

The driver was a broader slide in AI-linked stocks, as investors worried about whether the AI growth cycle can sustain itself. That fear overwhelmed a quarter that, by the source's own description, delivered strong earnings and positive guidance.

Interpretation: the move looks like a sentiment-driven derating rather than a fundamental reset. A 55.2% revenue growth print paired with an expanded 2028 capacity outlook would normally support the shares, yet ASML sold off in step with the AI complex. That suggests the stock is trading as a proxy for AI-cycle durability, not on standalone results.

The setup is a clean test of which force dominates: reported fundamentals or macro AI sentiment. An 11.5% monthly drop after a strong quarter and raised guidance is a divergence that traders watching for mean reversion will want to track.